One-stamp-mill mortar.



PATENTED JULY 80, 1907.

G. H. NISSEN. on STAMP MILL MORTAR.

2 SHEETS-SHEET 1.

I Inventor:

APPLICATION FILED JAN. 17,-1900.

y I v No. 862,098. PATENTED JULY so, 1907. G. H. NISSEN. our STAMP MILL MORTAR. APPLICATION FILPEDJAN. 17, 1900.

2 SHEETS-SHEET 2.

Inventor.

UNITED STATES PATENT OFFICE.

GEORGE HERMAN NISSEN, OF TORONTO, ONTARIO, CANADA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE NISSEN ENGINEERING COMPANY,

RITORY.

A CORPORATION OF ARIZONA TER- ONE-STAMP-MILL MORTAR.

Specification f Letters Patent.

Patented July 30, 1907.

Application filed Jamm 17,1900. serial No. 1,781.

To all whom it may concern:

Be it known that I, GEORGE HERMAN NISSEN, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, mining engineer, have invented certain new and useful Improvements in One-Stamp- Mill Mortars, of which the following is the specification.

My invention relates to improvements in ore stamp mill mortars and consists in certain novel combinations of elements and in certain peculiarities in. the construction and arrangement of parts substantially as hereinafter described and particularly pointed out in the subjoined claims.

The object ofthe invention is to provide a mortar which shall have maximum efficiency. In pursuance of this object 1 have found that by constructing the mortar of a form which is substantially circular in cross section and providing it with a recess in its lower portion and with an inlet located above said recess and on one side of the mortar and with a screened outlet for the crushed ore on the other side of said mortar, which outlet is above said recess and extends approximately half way round the mortar, and by further providing said mortar with an unbroken or solid wall portion opposite said outlet and with an amalgamating plate which is interposed between said recess and said inlet on the one hand and the recess and outlet on the other hand and which is inclined in an upward and outward direction from said recess approximately to the level of the screen of said outlet, there is thus provided the greatest extent of screen covered outlet consistent with strength and durability and efficiency, and at the same time a maximum extent of amalgamating surface below the place of outlet and in the proper location is secured, while there are no corners or dead spaces for the ore to lodge in. These features all cooperate in the securing of the end sought. 1 have also found that by so constructing the mortar that its internal surface flares outwardly above and contiguous to its said recess, and is substantially circular in horizontal section and has its said recess provided with an anvil or die against which the stamp operates,

which anvil or die is centrally disposed in said recess and which flaring surface supports the amalgamating plate, there are left no vacant or dead spaces in which ore may lodge and escape being crushed or interfere with the pulverized portion. All parts of the screen are equally distant from the center and there is an advantageous extent and character of surface exposed to the proper and timely escape of the ore to the outlet. It is desirable to provide said recess with a removable dining, and it is advantageous to extend said lining above the lower edge of the outwardly-flared portion of the mortar. It is further advantageous to provide said amalgamating plate with protecting foraminous coverings and I have devised a particular way of connecting said protecting foraminous coverings with amalgamating plates and also a particular relative arrangement of die, lining and amalgamating plate which is of great advantage. These parts will be hereinafter set forth in detail.

Another important feature is the recess which is made of reverse conefrustu1n shape and has its lining inclined and unbroken throughout.

These several and other features of the invention are embodied in the construction shown in the accompanying drawings, wherein Figure 1 is a sectional perspective view of a onestamp mill mortar constructed in accordance with my invention. Fig. 2 is a horizontal section through the same. Fig. 3 is a detail view of one section of the screen for protecting the amalgam. Fig. 4 is a detail view of one section of the amalgam plate.

In the drawings like letters of reference indicate corresponding parts in the several figures.

A designates the body of the mortar, all parts of which are preferably integral and which as hereinabove stated is circular in cross section and is formed to provide a recess B in its lower portion, in which the crushing is done, an outwardly flared portion B which forms an annular shoulder between the recess and the portion of the mortar above the same, above which shoulder there is formed in the wall of the mortar, a lateral outlet opening G through which the crushed ore is discharged. As hereinbefore stated, said outlet opening preferably extends approximately 1111f Way around the mortar and said recess is preferably of reverse-cone-frustum shape.

Opposite the outlet opening the Wall is provided with an inlet passage F for the ore, which passage leads downward from the top of the body of the mortar and is of such character that a solid wall is provided opposite the outlet opening G. To this end, the passage is preferably provided by forming the body of the mortar with inwardly extending vertical flanges f, f, which are connected with each other by a web or plate f, said flanges and plate terminating suitably above said shoulder B and said body having beneath said-flanges and plate a downwardly and inwardly inclined lip F which crosses the space between the main portion of the 'body and said plate and conducts the ore from said passage, across the said shoulder B and to the recess B. The solid curved wall extending around the back of the mortar opposite the opening and to a plane above the same not only adds great strength and durability but acts to direct and concentrate the lighter and thoroughly pulverized portion of the splash from the dies on to the screen and thereby greatly increases the capacity of the mill.

G is a screen which covers the outlet openingGu To hold said screen in place the body of the mortar is formed at the opposite edges of said openings with side Wings A and said body is also formed with an annular lip G; which projects outward therefrom and extends from one of said side wings to the other. It will be observed that the screen G is concentric in horizontal cross section with and equidistant from the die and'is arranged to present the openings in its meshes at right angles to radial lines drawn from the center of the die. Thus the splash caused by impact of the stamp on the die passes directly through the screen, and the referred to equidistant location of the latter equalizes the shock and strain of the pulp thereon.

The recess B is provided with a lining B which is preferably made of steel and which preferably fits closely to the wall thereof and extends to and slightly above the top of said recess, as indicated in Fig. 1.

The amalgamating plates D, which are preferably of copper, and made in sections as shown in Fig. 4, are supported in upwardly and outwardly inclined position upon the upwardly and outwardly inclined shoulder B aforesaid. The sections are located end to end and they form substantially an annular plate which extends irom the top of the recess, entirely around the mortar and projects to the screen G on one side and beneath the lip F and to the level of the screen on the other side of the mortar. Preferably the lower portions of the plates rest against the shoulder at the top of the recess, but they are held in position by the upper edge of the lining B, as shown at b in Fig. 1. To preserve the amalgam upon said plates they are covered by a screen E made preferably of woven wire and in sections having abutting edges. A most advantageous mode of connecting said sections removably to said plates comprises swinging lips e which are pivoted on the binding rods e of the sections and the overhanging lips e said lips extending beneath the edges of said plates.

Mounted in the recess 13 is the die or anvil C. Said die or anvil is circular in cross section and preferably of the same diameter throughout, except at its lower extremity, where it has a flange c which closes the bottom of the space between it and the lining B and tends to hold said lining in position. This flange also spaces the die from the adjacent walls and thus provides an annular recess of greater depth than width surrounding the die and forming a protected channel in which liquid will collect and will be constantly retained in prox imity to the dies at all times during the crushing operation. The die terminates below the plane of the top of the recess and the relative shape and size of said recess is such as that a maximum amount of ore is crushed in a minimum time. With the arrangement set forth, raising of the stamp causes the formation of a vacuum into which pulp rushes equally from all points and covers the die, so that when the stamp descends the die not only is covered, but is covered evenly. The lighter part of the splash caused by the impact of the stamp on the die passes directly through the screen and the heavier part spreads evenly over the amalgamating plates. As all parts of the screen are equidistant from the die, all parts thereof receive an equal amount of pulp, thus equalizing the wear as well as the shock and strain to which the screen is subjected.

From the foregoing it will be seen that I have pro vided a one stamp mill mortar adapted for the crushing of ores and in which a maximum amount of ore will be crushed on each descent of the stamp, and in which a most advantageous disposition of outlet, amalgamating plates, inlet and recess and die are comprised, and one in which the efiiciency of the mortar is not impaired by the scouring of the amalgamating plate or plates. It-Will further be observed that these important advantages are embraced in a structure which combines therewith the important advantages of extreme simplicity, accessibility of parts and capability of removal thereof for renewal or repair or in order to clean the same. Again it will be seen from the description and the illustrations of the drawings that I have provided a mortar wherein the uncrushed ore is contsantly directed to the dies and caused to concentrate thereon immediately after the fall of the stamp on the die, and the crushed or pulverized ore is constantly directed against the screened opening. 1 It will also be seen that the annular channel surrounding the die, on account of the peculiar construction and arrangement of the adjacent parts, is protected from the ore ladened splash which is thrown from the dies at each fall of the stamp and that in this manner a constant body of liquid is provided at the point where it is most needed: at the contacting surfaces of the dies. Mortars of this character are commonly provided with feed mechanism regulated by the fall of the stamp so that the quantity of ore fed to the stamp is governed by the amount of ore between the dies. Thus when there is a considerable amount of uncrushed ore between the dies, the upper die or stamp will be checked in its descent before it comes in contact with the lower die, and in this case the feed mechanism connected with the stamp rod will not be operated, while, on the other hand, when there is little or no ore at the top of the lower die the stamp will descend until it comes in contact with the lower die and the feed mechanism will be operated to admit more ore. It is of great importance, therefore, that the uncrushed ore in the mortar shall be caused to quickly return to the lower die when the stamp is raised as otherwise the stamp would fall to its lowest point and cause ore to be admitted while there is still a considerable quantity of uncrushed ore in the mortar. This would result in an excessive supply of ore and the consequent clogging of the mill, which would impair its operation and result in injury to the structure as well as waste of the power used in operating the mill. With the construction and arrangement herein described, however, the uncrushed ore returns to the lower die immediately and from all parts of the mortar, and is assisted in so doing by the suction caused by the raising of the stamp. It will further'be seen that the body of water surrounding the 'lower die, the annular inclined portion above the same giving the particles of ore a converging direction, the curved unbroken Wall above the flared portion and the lip of the feed inlet all contribute to this end. At the same time the said unbroken wall deflects the lighter and thoroughly pulverized ore, which is in condition to be discharged from the mortar, upon the screen opening. It Will be understood that all the precious metal cannot be recovered in the mortar and that it is desirable to have metal-bearing pulp discharged through the screen, where it may be caused to How over suitable said lining:

amalgamating plates outside the mortar. The construction and arrangement of my mortar is such, however, that much more ore can be crushed therein than can be treated by the interior amalgamating plates, where the character of the ore will permit it, without affecting the operation of the said interior plates or any other part. If circumstances require it or make it advisable the interior amalgamating plates may be removed and the mortar used for the purpose of crushing the ore only.

Having thus described the invention, what I believe to be new and desire to secure by Letters Patent, is:

1. In an ore stamp mill mortar, the combination of a body having an inlet for ore, an outlet for the pulverized ore. a recess within which the ore is pulverized and an outwardly and upwardly flared portion extending from the upper part of the recess to the level of the discharge opening, an annular amalgamating plate on said flared portion substantially covering the same, protecting plates covering said amalgamating plate and detachably connected thereto. and a die in said recess.

:2. The hereindescribed ore stamp mill mortar, comprising a body having in its lower portion a recess within which the ore is crushed, a supply and a discharge opening above said recess and an annular flared portion extend ing from the upper edge of the recess to the level of the discharge opening, said recess having oblique sides; a die located in the bottom of said recess and formed with substantially vertical sides; a lining for said recess, said die and lining being relatively arranged to provide an annular space between them, extending to the bottom of the die: an annular amalgamating plate covering said flared portion of the body; and a protecting plate covering said amalgamating plate.

I). The hereindescribed ore stamp mill mortar, compris ing a body having in its lower portion a recess within which the ore is crushed, a supply and a discharge opening above said recess, and an annular flared portion extending i'rom the upper edge of the recess to [the level of the discharge opening, said recess having oblique sides; a die localed in the bottom of said recess and formed with substantially vertical sides; a removable lining extending to the bottom of said recess and to the lower edge of the die. said die and lining being relatively arranged to provide an annular space between them extending to the bottom of the die; an annular amalgamating plate covering said flared portion of the body; and a protecting plate covering said amalgamating plate and made in a plurality of parts.

4. An ore stamp mill, comprising a mortar of substantially cylindrical form having a recess, an inlet for ore above said recess on one side of the mortar, and a screened opening for the discharge of the crushed product on the opposite side of said mortar extending approximately half way around the wall of the same above said recess; an amalgamating plate extending upward and outward lfrom said recess and having a portion terminating at the screen and its remaining portion, on the side of the mortar opposite said screen,.extending to the level of said screen; the said mortar also having an unbroken wall extending from the upper er ge of the amalgamating plate to a point above the top of the screen and above the inlet, on the side of the mortar opposite said screen.

An ore-stamp mill mortar, comprising a body having in its bottom a recess to receive the die of the mortar, and provided with an inclined portion which joins the upper end of the wall of said recess. an amalgamating plate supported on said inclined portion, a screen superimposed on said plate, and a lining for the wall of said recess extending above the plane of said inclined portion of the casing and the lower edge of said amalgamating plate.

(5. An ore-stamp mill mortar, comprising a body having in its bottom a reverse-frustumcone shaped recess provided with a separately-formed lining closely fitted thereto and continuously inclined and unbroken throughout, said body also having an annular inclined portion which joins the upper end of said wall below the plane of the upper end of circular]yalrranged amalgamating plates supported on said inclined portion and having their inner ends in juxtaposition to the portion of said lining which is locatcd above the junction of said inclined portion and the wall or the recess, screen superimposed on said plates, and a die having its lower end engaged by the bottom of the lining and its upper and below the plane of the top of the same, substantially as described and for the purposes set forth.

T. An ore-stamp mill mortar, comprising a body having in its bottom a reverse-frustum-coneshaped-recess with its Wall continuously inclined and unbroken throughout, and provided with an annular inclined portion which extends to the upper end of said wall, said body also having at one side an inlet opening leading to said recess and at its other side an outlet opening above said annular inclined portion, and provided with side wings extending outward from opposite sides 01' said outlet opening and with a lip extending from one wing to the other a die having its lower end adjacent to the bottom of the inclined wall of said recess and its upper end below the top of said wall; an amalgamating plate on said inclined portion; and a screen supported on said lip and having its ends held by said wings.

8. An ore stamp mill comprising a mortar which is substantially circular in cross section and has a recess in its lower part in which the ore is crushed, a flared portion above said recess and an outlet opening above said flared portion the body 01' said mortar also having, oppositesaid outlet, inwardly extending vertical flanges which terminate above the flared portion and have their innererges connected with each other by a plate, and said body also having a lip which is arranged between said flared portion and the terminals of said flanges and directs the ore to the recess; a circular die in said recess, an amalgamating plate on the flared portion of the body, and a curved screen covering said outlet opening.

9. An ore stamp mortar, comprising a casing having in its bottom a recess to receive the die of the mortar and provided with an inclined portion which joins the upper end of the wall of said recess, an amalgamating plate supported on said inclined portion, and a lining for the wall of said recess extending above the lower edge of said amalgamating plate.

10. An ore stamp mortar, comprising a substantially cylindrical casing having in its bottom a recess to receive the die of the mortar and provided with an inclined portion which joins the upper end of the wall of said recess, an annular amalgamating plate supported on said inclined portion, and a lining for the wall of said recess.

11. An ore stamp mortar, comprising a substantially cylindrical casing having in its bottom a recess to receive the die of the mortar and provided with an inclined pow tion which joins the upper end of the wall of said recess, an annular amalgamating plate supported on said inclined portion, a foraminous protecting cover on said plate, and a lining for thewall of said recess.

12. The combination of a substantially cylindrical mortar having a recess in its lower part and a lateral outlet opening at the upper part of said recess, a die in said recess of lesser diameter than the same, the wall of the recess and the die being relatively arranged to provide an open space which is of greater depth than width and surrounds the die, said mortar also having an annular inclined portion which joins the upper end of the wall of the recess.

13. The combination of a substantially cylindrical mortar having a recess in its lower part and a lateral outlet opening at the upper part of said recess, a die in said recess of lesser diameter than the same, the wall of the recess and the die being relatively arranged to provide an open space which. is of greater depth than width and surrounds the die, said mortar having an annular inclined portion which joins the upper end of the wall of the recess and vertical walls above said inclined portion, said outlet opening extending approximately half way around the same, and said walls also having an unbroken portion which extends from the edges of said opening around the mortar and to a plane higher than the said openin 14. An ore stamp mortar, comprising a casing, having in its bottom a recess, a die in said recess, the said casing provided with an inclined annular portion which joins the upper end of the wall of said recess and is located outsidethe plane thereof, an amalgamating plate supported on said inclined portion, and a lining for the wall 01' said recess.

15. An ore stamp mill comprising a mortar which is substantially circular in cross section and has a recess in its lower part in which the ore is crushed, a flared portion above said recess and a screened outlet opening and an inlet opening above said flared portion, the body of said mortar also constructed to provide a solid wall which is arranged opposite said outlet opening, and a lip which is arranged between the inlet opening and the flared portion and extends over the latter and directs the material to the recess.-

16. The combination of a substantially cylindrical mortar provided with inlet and outlet openings, a substantially round die located in the lower part thereof and having a horizontally projecting portion at its lower part spacing the die from the walls of the mortar and providing an annular space between it and said walls of greater depth than width.

17. In a one stamp-mill mortar, the combination of amalgamating plate located on the interior thereof, a

protecting plate covering said amalgamating plate, and means for connecting the said plates, comprising swinging pieces secured to one plate and extending over the edge and upon the outer surface of the other plate.

18. The combination of a mortar having substantially cylindrical walls, a die in the lower part thereof of lesser diameter than the interior diameter of the mortar, means for spacing the said die from the inner walls of the mortar whereby an annular space is provided between the walls and said die, having a greater depth than width and being substantially uniform in horizontal cross-section said mortar having inlet and outlet openings above the said annular space, an interior lining surrounding the die and in contact with the wa'ls of the mortar extending from top to bottom of the annular space, means for causing the ore entering the mortar to pass over the said annular space above the outlet opening and an unbroken portion of the mortar wall opposite and equal in area to the said opening. I

GEORGE HERMAN NISSEN.

Witnesses B. BOYD, L. TRIMBLE. 

